A 29-year-old pregnant woman, gravida 2, para 1, is evaluated in the outpatient clinic for a routine prenatal visit at 28 weeks gestation. She has no chronic medical conditions and takes only a daily prenatal vitamin. She has never smoked cigarettes, consumed alcohol, or used illicit drugs. Her last cervical cancer screening was at age 27 and was normal. During her previous pregnancy three years ago, she received all standard prenatal care and immunizations. Today, her blood pressure is 112/70 mm Hg and her heart rate is 78/min. Fetal heart tones are normal. Which of the following is the most appropriate immunization to administer to this patient at this visit?
- Tetanus toxoid, reduced diphtheria toxoid, and acellular pertussis (Tdap) vaccineAnswer
- BMeasles, mumps, and rubella (MMR) vaccine
- CVaricella vaccine
- DHuman papillomavirus (HPV) vaccine
- ELive attenuated influenza vaccine
Answer
Tetanus toxoid, reduced diphtheria toxoid, and acellular pertussis (Tdap) vaccine
The correct action is to administer the tetanus toxoid, reduced diphtheria toxoid, and acellular pertussis (Tdap) vaccine. The Advisory Committee on Immunization Practices (ACIP) and the American College of Obstetricians and Gynecologists (ACOG) strongly recommend administering the Tdap vaccine during every pregnancy, optimally between 27 and 36 weeks of gestation. This timing maximizes the maternal antibody response and subsequent transplacental transfer of IgG antibodies, which provides critical passive immunity against pertussis to the newborn during the first few months of life before the infant can receive their own primary series. This requirement applies regardless of whether the patient received Tdap during a previous pregnancy or how recently a prior dose was given.
Step-by-Step Solution
Key Concept
The Tdap vaccine is recommended during every pregnancy, ideally between 27 and 36 weeks of gestation, regardless of the patient's prior vaccination history. Live-virus vaccines are strictly contraindicated during pregnancy.